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A certin deck of cards contains 2 blue cards,2 red cards,2 [#permalink]
06 Jan 2004, 11:53

** A certin deck of cards contains 2 blue cards,2 red cards,2 yellow cards and 2 green cards.If two cards are randomly drawn from the deck,what is the probability that they both will not be blue?

1) 15/28
2) 1/4
3) 9/16
4) 1/32
5) 1/16

** A bag of 10 marbles contains 3 red marbles and 7 blue marbles.If 2 marbles are selected at randon ,what is the probability that at least one marble is blue?

1) 21/50
2) 3/13
3) 47/50
4) 14/15
5) 1/5

Please provide an explantion.

Vivek. _________________

"Start By Doing What Is Necessary ,Then What Is Possible & Suddenly You Will Realise That You Are Doing The Impossible"

vivek, I see your point quite clearly. your answer is right since the question does specifically ask the probability of not getting two blue balls. since there's no answer choice for 27/28 I'm assuming that it's asking: "what's the probability that there are no blue balls chosen" where did you find this problem?

Re: Probability Q's [#permalink]
07 Jan 2004, 03:15

Quote:

A certin deck of cards contains 2 blue cards,2 red cards,2 yellow cards and 2 green cards.If two cards are randomly drawn from the deck,what is the probability that they both will not be blue?

1) 15/28 2) 1/4 3) 9/16 4) 1/32 5) 1/16

6C2/8C2 = 15/28

Quote:

A bag of 10 marbles contains 3 red marbles and 7 blue marbles.If 2 marbles are selected at randon ,what is the probability that at least one marble is blue?

1) 21/50 2) 3/13 3) 47/50 4) 14/15 5) 1/5

Please provide an explantion.

1- 3C2 / 10C2 = 14/15

gmatclubot

Re: Probability Q's
[#permalink]
07 Jan 2004, 03:15